Andrew's git / gitweb.git / builtin/rebase.c
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builtin / rebase.con commit worktree: fix worktree add race (7af01f2)
   1/*
   2 * "git rebase" builtin command
   3 *
   4 * Copyright (c) 2018 Pratik Karki
   5 */
   6
   7#define USE_THE_INDEX_COMPATIBILITY_MACROS
   8#include "builtin.h"
   9#include "run-command.h"
  10#include "exec-cmd.h"
  11#include "argv-array.h"
  12#include "dir.h"
  13#include "packfile.h"
  14#include "refs.h"
  15#include "quote.h"
  16#include "config.h"
  17#include "cache-tree.h"
  18#include "unpack-trees.h"
  19#include "lockfile.h"
  20#include "parse-options.h"
  21#include "commit.h"
  22#include "diff.h"
  23#include "wt-status.h"
  24#include "revision.h"
  25#include "commit-reach.h"
  26#include "rerere.h"
  27#include "branch.h"
  28
  29static char const * const builtin_rebase_usage[] = {
  30        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
  31                "[<upstream>] [<branch>]"),
  32        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
  33                "--root [<branch>]"),
  34        N_("git rebase --continue | --abort | --skip | --edit-todo"),
  35        NULL
  36};
  37
  38static GIT_PATH_FUNC(apply_dir, "rebase-apply")
  39static GIT_PATH_FUNC(merge_dir, "rebase-merge")
  40
  41enum rebase_type {
  42        REBASE_UNSPECIFIED = -1,
  43        REBASE_AM,
  44        REBASE_MERGE,
  45        REBASE_INTERACTIVE,
  46        REBASE_PRESERVE_MERGES
  47};
  48
  49static int use_builtin_rebase(void)
  50{
  51        struct child_process cp = CHILD_PROCESS_INIT;
  52        struct strbuf out = STRBUF_INIT;
  53        int ret, env = git_env_bool("GIT_TEST_REBASE_USE_BUILTIN", -1);
  54
  55        if (env != -1)
  56                return env;
  57
  58        argv_array_pushl(&cp.args,
  59                         "config", "--bool", "rebase.usebuiltin", NULL);
  60        cp.git_cmd = 1;
  61        if (capture_command(&cp, &out, 6)) {
  62                strbuf_release(&out);
  63                return 1;
  64        }
  65
  66        strbuf_trim(&out);
  67        ret = !strcmp("true", out.buf);
  68        strbuf_release(&out);
  69        return ret;
  70}
  71
  72struct rebase_options {
  73        enum rebase_type type;
  74        const char *state_dir;
  75        struct commit *upstream;
  76        const char *upstream_name;
  77        const char *upstream_arg;
  78        char *head_name;
  79        struct object_id orig_head;
  80        struct commit *onto;
  81        const char *onto_name;
  82        const char *revisions;
  83        const char *switch_to;
  84        int root;
  85        struct object_id *squash_onto;
  86        struct commit *restrict_revision;
  87        int dont_finish_rebase;
  88        enum {
  89                REBASE_NO_QUIET = 1<<0,
  90                REBASE_VERBOSE = 1<<1,
  91                REBASE_DIFFSTAT = 1<<2,
  92                REBASE_FORCE = 1<<3,
  93                REBASE_INTERACTIVE_EXPLICIT = 1<<4,
  94        } flags;
  95        struct argv_array git_am_opts;
  96        const char *action;
  97        int signoff;
  98        int allow_rerere_autoupdate;
  99        int keep_empty;
 100        int autosquash;
 101        char *gpg_sign_opt;
 102        int autostash;
 103        char *cmd;
 104        int allow_empty_message;
 105        int rebase_merges, rebase_cousins;
 106        char *strategy, *strategy_opts;
 107        struct strbuf git_format_patch_opt;
 108        int reschedule_failed_exec;
 109};
 110
 111static int is_interactive(struct rebase_options *opts)
 112{
 113        return opts->type == REBASE_INTERACTIVE ||
 114                opts->type == REBASE_PRESERVE_MERGES;
 115}
 116
 117static void imply_interactive(struct rebase_options *opts, const char *option)
 118{
 119        switch (opts->type) {
 120        case REBASE_AM:
 121                die(_("%s requires an interactive rebase"), option);
 122                break;
 123        case REBASE_INTERACTIVE:
 124        case REBASE_PRESERVE_MERGES:
 125                break;
 126        case REBASE_MERGE:
 127                /* we now implement --merge via --interactive */
 128        default:
 129                opts->type = REBASE_INTERACTIVE; /* implied */
 130                break;
 131        }
 132}
 133
 134/* Returns the filename prefixed by the state_dir */
 135static const char *state_dir_path(const char *filename, struct rebase_options *opts)
 136{
 137        static struct strbuf path = STRBUF_INIT;
 138        static size_t prefix_len;
 139
 140        if (!prefix_len) {
 141                strbuf_addf(&path, "%s/", opts->state_dir);
 142                prefix_len = path.len;
 143        }
 144
 145        strbuf_setlen(&path, prefix_len);
 146        strbuf_addstr(&path, filename);
 147        return path.buf;
 148}
 149
 150/* Read one file, then strip line endings */
 151static int read_one(const char *path, struct strbuf *buf)
 152{
 153        if (strbuf_read_file(buf, path, 0) < 0)
 154                return error_errno(_("could not read '%s'"), path);
 155        strbuf_trim_trailing_newline(buf);
 156        return 0;
 157}
 158
 159/* Initialize the rebase options from the state directory. */
 160static int read_basic_state(struct rebase_options *opts)
 161{
 162        struct strbuf head_name = STRBUF_INIT;
 163        struct strbuf buf = STRBUF_INIT;
 164        struct object_id oid;
 165
 166        if (read_one(state_dir_path("head-name", opts), &head_name) ||
 167            read_one(state_dir_path("onto", opts), &buf))
 168                return -1;
 169        opts->head_name = starts_with(head_name.buf, "refs/") ?
 170                xstrdup(head_name.buf) : NULL;
 171        strbuf_release(&head_name);
 172        if (get_oid(buf.buf, &oid))
 173                return error(_("could not get 'onto': '%s'"), buf.buf);
 174        opts->onto = lookup_commit_or_die(&oid, buf.buf);
 175
 176        /*
 177         * We always write to orig-head, but interactive rebase used to write to
 178         * head. Fall back to reading from head to cover for the case that the
 179         * user upgraded git with an ongoing interactive rebase.
 180         */
 181        strbuf_reset(&buf);
 182        if (file_exists(state_dir_path("orig-head", opts))) {
 183                if (read_one(state_dir_path("orig-head", opts), &buf))
 184                        return -1;
 185        } else if (read_one(state_dir_path("head", opts), &buf))
 186                return -1;
 187        if (get_oid(buf.buf, &opts->orig_head))
 188                return error(_("invalid orig-head: '%s'"), buf.buf);
 189
 190        if (file_exists(state_dir_path("quiet", opts)))
 191                opts->flags &= ~REBASE_NO_QUIET;
 192        else
 193                opts->flags |= REBASE_NO_QUIET;
 194
 195        if (file_exists(state_dir_path("verbose", opts)))
 196                opts->flags |= REBASE_VERBOSE;
 197
 198        if (file_exists(state_dir_path("signoff", opts))) {
 199                opts->signoff = 1;
 200                opts->flags |= REBASE_FORCE;
 201        }
 202
 203        if (file_exists(state_dir_path("allow_rerere_autoupdate", opts))) {
 204                strbuf_reset(&buf);
 205                if (read_one(state_dir_path("allow_rerere_autoupdate", opts),
 206                            &buf))
 207                        return -1;
 208                if (!strcmp(buf.buf, "--rerere-autoupdate"))
 209                        opts->allow_rerere_autoupdate = 1;
 210                else if (!strcmp(buf.buf, "--no-rerere-autoupdate"))
 211                        opts->allow_rerere_autoupdate = 0;
 212                else
 213                        warning(_("ignoring invalid allow_rerere_autoupdate: "
 214                                  "'%s'"), buf.buf);
 215        } else
 216                opts->allow_rerere_autoupdate = -1;
 217
 218        if (file_exists(state_dir_path("gpg_sign_opt", opts))) {
 219                strbuf_reset(&buf);
 220                if (read_one(state_dir_path("gpg_sign_opt", opts),
 221                            &buf))
 222                        return -1;
 223                free(opts->gpg_sign_opt);
 224                opts->gpg_sign_opt = xstrdup(buf.buf);
 225        }
 226
 227        if (file_exists(state_dir_path("strategy", opts))) {
 228                strbuf_reset(&buf);
 229                if (read_one(state_dir_path("strategy", opts), &buf))
 230                        return -1;
 231                free(opts->strategy);
 232                opts->strategy = xstrdup(buf.buf);
 233        }
 234
 235        if (file_exists(state_dir_path("strategy_opts", opts))) {
 236                strbuf_reset(&buf);
 237                if (read_one(state_dir_path("strategy_opts", opts), &buf))
 238                        return -1;
 239                free(opts->strategy_opts);
 240                opts->strategy_opts = xstrdup(buf.buf);
 241        }
 242
 243        strbuf_release(&buf);
 244
 245        return 0;
 246}
 247
 248static int write_basic_state(struct rebase_options *opts)
 249{
 250        write_file(state_dir_path("head-name", opts), "%s",
 251                   opts->head_name ? opts->head_name : "detached HEAD");
 252        write_file(state_dir_path("onto", opts), "%s",
 253                   opts->onto ? oid_to_hex(&opts->onto->object.oid) : "");
 254        write_file(state_dir_path("orig-head", opts), "%s",
 255                   oid_to_hex(&opts->orig_head));
 256        write_file(state_dir_path("quiet", opts), "%s",
 257                   opts->flags & REBASE_NO_QUIET ? "" : "t");
 258        if (opts->flags & REBASE_VERBOSE)
 259                write_file(state_dir_path("verbose", opts), "%s", "");
 260        if (opts->strategy)
 261                write_file(state_dir_path("strategy", opts), "%s",
 262                           opts->strategy);
 263        if (opts->strategy_opts)
 264                write_file(state_dir_path("strategy_opts", opts), "%s",
 265                           opts->strategy_opts);
 266        if (opts->allow_rerere_autoupdate >= 0)
 267                write_file(state_dir_path("allow_rerere_autoupdate", opts),
 268                           "-%s-rerere-autoupdate",
 269                           opts->allow_rerere_autoupdate ? "" : "-no");
 270        if (opts->gpg_sign_opt)
 271                write_file(state_dir_path("gpg_sign_opt", opts), "%s",
 272                           opts->gpg_sign_opt);
 273        if (opts->signoff)
 274                write_file(state_dir_path("strategy", opts), "--signoff");
 275
 276        return 0;
 277}
 278
 279static int apply_autostash(struct rebase_options *opts)
 280{
 281        const char *path = state_dir_path("autostash", opts);
 282        struct strbuf autostash = STRBUF_INIT;
 283        struct child_process stash_apply = CHILD_PROCESS_INIT;
 284
 285        if (!file_exists(path))
 286                return 0;
 287
 288        if (read_one(path, &autostash))
 289                return error(_("Could not read '%s'"), path);
 290        /* Ensure that the hash is not mistaken for a number */
 291        strbuf_addstr(&autostash, "^0");
 292        argv_array_pushl(&stash_apply.args,
 293                         "stash", "apply", autostash.buf, NULL);
 294        stash_apply.git_cmd = 1;
 295        stash_apply.no_stderr = stash_apply.no_stdout =
 296                stash_apply.no_stdin = 1;
 297        if (!run_command(&stash_apply))
 298                printf(_("Applied autostash.\n"));
 299        else {
 300                struct argv_array args = ARGV_ARRAY_INIT;
 301                int res = 0;
 302
 303                argv_array_pushl(&args,
 304                                 "stash", "store", "-m", "autostash", "-q",
 305                                 autostash.buf, NULL);
 306                if (run_command_v_opt(args.argv, RUN_GIT_CMD))
 307                        res = error(_("Cannot store %s"), autostash.buf);
 308                argv_array_clear(&args);
 309                strbuf_release(&autostash);
 310                if (res)
 311                        return res;
 312
 313                fprintf(stderr,
 314                        _("Applying autostash resulted in conflicts.\n"
 315                          "Your changes are safe in the stash.\n"
 316                          "You can run \"git stash pop\" or \"git stash drop\" "
 317                          "at any time.\n"));
 318        }
 319
 320        strbuf_release(&autostash);
 321        return 0;
 322}
 323
 324static int finish_rebase(struct rebase_options *opts)
 325{
 326        struct strbuf dir = STRBUF_INIT;
 327        const char *argv_gc_auto[] = { "gc", "--auto", NULL };
 328
 329        delete_ref(NULL, "REBASE_HEAD", NULL, REF_NO_DEREF);
 330        apply_autostash(opts);
 331        close_all_packs(the_repository->objects);
 332        /*
 333         * We ignore errors in 'gc --auto', since the
 334         * user should see them.
 335         */
 336        run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
 337        strbuf_addstr(&dir, opts->state_dir);
 338        remove_dir_recursively(&dir, 0);
 339        strbuf_release(&dir);
 340
 341        return 0;
 342}
 343
 344static struct commit *peel_committish(const char *name)
 345{
 346        struct object *obj;
 347        struct object_id oid;
 348
 349        if (get_oid(name, &oid))
 350                return NULL;
 351        obj = parse_object(the_repository, &oid);
 352        return (struct commit *)peel_to_type(name, 0, obj, OBJ_COMMIT);
 353}
 354
 355static void add_var(struct strbuf *buf, const char *name, const char *value)
 356{
 357        if (!value)
 358                strbuf_addf(buf, "unset %s; ", name);
 359        else {
 360                strbuf_addf(buf, "%s=", name);
 361                sq_quote_buf(buf, value);
 362                strbuf_addstr(buf, "; ");
 363        }
 364}
 365
 366#define GIT_REFLOG_ACTION_ENVIRONMENT "GIT_REFLOG_ACTION"
 367
 368#define RESET_HEAD_DETACH (1<<0)
 369#define RESET_HEAD_HARD (1<<1)
 370#define RESET_HEAD_RUN_POST_CHECKOUT_HOOK (1<<2)
 371#define RESET_HEAD_REFS_ONLY (1<<3)
 372
 373static int reset_head(struct object_id *oid, const char *action,
 374                      const char *switch_to_branch, unsigned flags,
 375                      const char *reflog_orig_head, const char *reflog_head)
 376{
 377        unsigned detach_head = flags & RESET_HEAD_DETACH;
 378        unsigned reset_hard = flags & RESET_HEAD_HARD;
 379        unsigned run_hook = flags & RESET_HEAD_RUN_POST_CHECKOUT_HOOK;
 380        unsigned refs_only = flags & RESET_HEAD_REFS_ONLY;
 381        struct object_id head_oid;
 382        struct tree_desc desc[2] = { { NULL }, { NULL } };
 383        struct lock_file lock = LOCK_INIT;
 384        struct unpack_trees_options unpack_tree_opts;
 385        struct tree *tree;
 386        const char *reflog_action;
 387        struct strbuf msg = STRBUF_INIT;
 388        size_t prefix_len;
 389        struct object_id *orig = NULL, oid_orig,
 390                *old_orig = NULL, oid_old_orig;
 391        int ret = 0, nr = 0;
 392
 393        if (switch_to_branch && !starts_with(switch_to_branch, "refs/"))
 394                BUG("Not a fully qualified branch: '%s'", switch_to_branch);
 395
 396        if (!refs_only && hold_locked_index(&lock, LOCK_REPORT_ON_ERROR) < 0) {
 397                ret = -1;
 398                goto leave_reset_head;
 399        }
 400
 401        if ((!oid || !reset_hard) && get_oid("HEAD", &head_oid)) {
 402                ret = error(_("could not determine HEAD revision"));
 403                goto leave_reset_head;
 404        }
 405
 406        if (!oid)
 407                oid = &head_oid;
 408
 409        if (refs_only)
 410                goto reset_head_refs;
 411
 412        memset(&unpack_tree_opts, 0, sizeof(unpack_tree_opts));
 413        setup_unpack_trees_porcelain(&unpack_tree_opts, action);
 414        unpack_tree_opts.head_idx = 1;
 415        unpack_tree_opts.src_index = the_repository->index;
 416        unpack_tree_opts.dst_index = the_repository->index;
 417        unpack_tree_opts.fn = reset_hard ? oneway_merge : twoway_merge;
 418        unpack_tree_opts.update = 1;
 419        unpack_tree_opts.merge = 1;
 420        if (!detach_head)
 421                unpack_tree_opts.reset = 1;
 422
 423        if (repo_read_index_unmerged(the_repository) < 0) {
 424                ret = error(_("could not read index"));
 425                goto leave_reset_head;
 426        }
 427
 428        if (!reset_hard && !fill_tree_descriptor(&desc[nr++], &head_oid)) {
 429                ret = error(_("failed to find tree of %s"),
 430                            oid_to_hex(&head_oid));
 431                goto leave_reset_head;
 432        }
 433
 434        if (!fill_tree_descriptor(&desc[nr++], oid)) {
 435                ret = error(_("failed to find tree of %s"), oid_to_hex(oid));
 436                goto leave_reset_head;
 437        }
 438
 439        if (unpack_trees(nr, desc, &unpack_tree_opts)) {
 440                ret = -1;
 441                goto leave_reset_head;
 442        }
 443
 444        tree = parse_tree_indirect(oid);
 445        prime_cache_tree(the_repository, the_repository->index, tree);
 446
 447        if (write_locked_index(the_repository->index, &lock, COMMIT_LOCK) < 0) {
 448                ret = error(_("could not write index"));
 449                goto leave_reset_head;
 450        }
 451
 452reset_head_refs:
 453        reflog_action = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
 454        strbuf_addf(&msg, "%s: ", reflog_action ? reflog_action : "rebase");
 455        prefix_len = msg.len;
 456
 457        if (!get_oid("ORIG_HEAD", &oid_old_orig))
 458                old_orig = &oid_old_orig;
 459        if (!get_oid("HEAD", &oid_orig)) {
 460                orig = &oid_orig;
 461                if (!reflog_orig_head) {
 462                        strbuf_addstr(&msg, "updating ORIG_HEAD");
 463                        reflog_orig_head = msg.buf;
 464                }
 465                update_ref(reflog_orig_head, "ORIG_HEAD", orig, old_orig, 0,
 466                           UPDATE_REFS_MSG_ON_ERR);
 467        } else if (old_orig)
 468                delete_ref(NULL, "ORIG_HEAD", old_orig, 0);
 469        if (!reflog_head) {
 470                strbuf_setlen(&msg, prefix_len);
 471                strbuf_addstr(&msg, "updating HEAD");
 472                reflog_head = msg.buf;
 473        }
 474        if (!switch_to_branch)
 475                ret = update_ref(reflog_head, "HEAD", oid, orig,
 476                                 detach_head ? REF_NO_DEREF : 0,
 477                                 UPDATE_REFS_MSG_ON_ERR);
 478        else {
 479                ret = update_ref(reflog_orig_head, switch_to_branch, oid,
 480                                 NULL, 0, UPDATE_REFS_MSG_ON_ERR);
 481                if (!ret)
 482                        ret = create_symref("HEAD", switch_to_branch,
 483                                            reflog_head);
 484        }
 485        if (run_hook)
 486                run_hook_le(NULL, "post-checkout",
 487                            oid_to_hex(orig ? orig : &null_oid),
 488                            oid_to_hex(oid), "1", NULL);
 489
 490leave_reset_head:
 491        strbuf_release(&msg);
 492        rollback_lock_file(&lock);
 493        while (nr)
 494                free((void *)desc[--nr].buffer);
 495        return ret;
 496}
 497
 498static int move_to_original_branch(struct rebase_options *opts)
 499{
 500        struct strbuf orig_head_reflog = STRBUF_INIT, head_reflog = STRBUF_INIT;
 501        int ret;
 502
 503        if (!opts->head_name)
 504                return 0; /* nothing to move back to */
 505
 506        if (!opts->onto)
 507                BUG("move_to_original_branch without onto");
 508
 509        strbuf_addf(&orig_head_reflog, "rebase finished: %s onto %s",
 510                    opts->head_name, oid_to_hex(&opts->onto->object.oid));
 511        strbuf_addf(&head_reflog, "rebase finished: returning to %s",
 512                    opts->head_name);
 513        ret = reset_head(NULL, "", opts->head_name, RESET_HEAD_REFS_ONLY,
 514                         orig_head_reflog.buf, head_reflog.buf);
 515
 516        strbuf_release(&orig_head_reflog);
 517        strbuf_release(&head_reflog);
 518        return ret;
 519}
 520
 521static const char *resolvemsg =
 522N_("Resolve all conflicts manually, mark them as resolved with\n"
 523"\"git add/rm <conflicted_files>\", then run \"git rebase --continue\".\n"
 524"You can instead skip this commit: run \"git rebase --skip\".\n"
 525"To abort and get back to the state before \"git rebase\", run "
 526"\"git rebase --abort\".");
 527
 528static int run_am(struct rebase_options *opts)
 529{
 530        struct child_process am = CHILD_PROCESS_INIT;
 531        struct child_process format_patch = CHILD_PROCESS_INIT;
 532        struct strbuf revisions = STRBUF_INIT;
 533        int status;
 534        char *rebased_patches;
 535
 536        am.git_cmd = 1;
 537        argv_array_push(&am.args, "am");
 538
 539        if (opts->action && !strcmp("continue", opts->action)) {
 540                argv_array_push(&am.args, "--resolved");
 541                argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 542                if (opts->gpg_sign_opt)
 543                        argv_array_push(&am.args, opts->gpg_sign_opt);
 544                status = run_command(&am);
 545                if (status)
 546                        return status;
 547
 548                return move_to_original_branch(opts);
 549        }
 550        if (opts->action && !strcmp("skip", opts->action)) {
 551                argv_array_push(&am.args, "--skip");
 552                argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 553                status = run_command(&am);
 554                if (status)
 555                        return status;
 556
 557                return move_to_original_branch(opts);
 558        }
 559        if (opts->action && !strcmp("show-current-patch", opts->action)) {
 560                argv_array_push(&am.args, "--show-current-patch");
 561                return run_command(&am);
 562        }
 563
 564        strbuf_addf(&revisions, "%s...%s",
 565                    oid_to_hex(opts->root ?
 566                               /* this is now equivalent to !opts->upstream */
 567                               &opts->onto->object.oid :
 568                               &opts->upstream->object.oid),
 569                    oid_to_hex(&opts->orig_head));
 570
 571        rebased_patches = xstrdup(git_path("rebased-patches"));
 572        format_patch.out = open(rebased_patches,
 573                                O_WRONLY | O_CREAT | O_TRUNC, 0666);
 574        if (format_patch.out < 0) {
 575                status = error_errno(_("could not open '%s' for writing"),
 576                                     rebased_patches);
 577                free(rebased_patches);
 578                argv_array_clear(&am.args);
 579                return status;
 580        }
 581
 582        format_patch.git_cmd = 1;
 583        argv_array_pushl(&format_patch.args, "format-patch", "-k", "--stdout",
 584                         "--full-index", "--cherry-pick", "--right-only",
 585                         "--src-prefix=a/", "--dst-prefix=b/", "--no-renames",
 586                         "--no-cover-letter", "--pretty=mboxrd", "--topo-order", NULL);
 587        if (opts->git_format_patch_opt.len)
 588                argv_array_split(&format_patch.args,
 589                                 opts->git_format_patch_opt.buf);
 590        argv_array_push(&format_patch.args, revisions.buf);
 591        if (opts->restrict_revision)
 592                argv_array_pushf(&format_patch.args, "^%s",
 593                                 oid_to_hex(&opts->restrict_revision->object.oid));
 594
 595        status = run_command(&format_patch);
 596        if (status) {
 597                unlink(rebased_patches);
 598                free(rebased_patches);
 599                argv_array_clear(&am.args);
 600
 601                reset_head(&opts->orig_head, "checkout", opts->head_name, 0,
 602                           "HEAD", NULL);
 603                error(_("\ngit encountered an error while preparing the "
 604                        "patches to replay\n"
 605                        "these revisions:\n"
 606                        "\n    %s\n\n"
 607                        "As a result, git cannot rebase them."),
 608                      opts->revisions);
 609
 610                strbuf_release(&revisions);
 611                return status;
 612        }
 613        strbuf_release(&revisions);
 614
 615        am.in = open(rebased_patches, O_RDONLY);
 616        if (am.in < 0) {
 617                status = error_errno(_("could not open '%s' for reading"),
 618                                     rebased_patches);
 619                free(rebased_patches);
 620                argv_array_clear(&am.args);
 621                return status;
 622        }
 623
 624        argv_array_pushv(&am.args, opts->git_am_opts.argv);
 625        argv_array_push(&am.args, "--rebasing");
 626        argv_array_pushf(&am.args, "--resolvemsg=%s", resolvemsg);
 627        argv_array_push(&am.args, "--patch-format=mboxrd");
 628        if (opts->allow_rerere_autoupdate > 0)
 629                argv_array_push(&am.args, "--rerere-autoupdate");
 630        else if (opts->allow_rerere_autoupdate == 0)
 631                argv_array_push(&am.args, "--no-rerere-autoupdate");
 632        if (opts->gpg_sign_opt)
 633                argv_array_push(&am.args, opts->gpg_sign_opt);
 634        status = run_command(&am);
 635        unlink(rebased_patches);
 636        free(rebased_patches);
 637
 638        if (!status) {
 639                return move_to_original_branch(opts);
 640        }
 641
 642        if (is_directory(opts->state_dir))
 643                write_basic_state(opts);
 644
 645        return status;
 646}
 647
 648static int run_specific_rebase(struct rebase_options *opts)
 649{
 650        const char *argv[] = { NULL, NULL };
 651        struct strbuf script_snippet = STRBUF_INIT, buf = STRBUF_INIT;
 652        int status;
 653        const char *backend, *backend_func;
 654
 655        if (opts->type == REBASE_INTERACTIVE) {
 656                /* Run builtin interactive rebase */
 657                struct child_process child = CHILD_PROCESS_INIT;
 658
 659                argv_array_pushf(&child.env_array, "GIT_CHERRY_PICK_HELP=%s",
 660                                 resolvemsg);
 661                if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
 662                        argv_array_push(&child.env_array,
 663                                        "GIT_SEQUENCE_EDITOR=:");
 664                        opts->autosquash = 0;
 665                }
 666
 667                child.git_cmd = 1;
 668                argv_array_push(&child.args, "rebase--interactive");
 669
 670                if (opts->action)
 671                        argv_array_pushf(&child.args, "--%s", opts->action);
 672                if (opts->keep_empty)
 673                        argv_array_push(&child.args, "--keep-empty");
 674                if (opts->rebase_merges)
 675                        argv_array_push(&child.args, "--rebase-merges");
 676                if (opts->rebase_cousins)
 677                        argv_array_push(&child.args, "--rebase-cousins");
 678                if (opts->autosquash)
 679                        argv_array_push(&child.args, "--autosquash");
 680                if (opts->flags & REBASE_VERBOSE)
 681                        argv_array_push(&child.args, "--verbose");
 682                if (opts->flags & REBASE_FORCE)
 683                        argv_array_push(&child.args, "--no-ff");
 684                if (opts->restrict_revision)
 685                        argv_array_pushf(&child.args,
 686                                         "--restrict-revision=^%s",
 687                                         oid_to_hex(&opts->restrict_revision->object.oid));
 688                if (opts->upstream)
 689                        argv_array_pushf(&child.args, "--upstream=%s",
 690                                         oid_to_hex(&opts->upstream->object.oid));
 691                if (opts->onto)
 692                        argv_array_pushf(&child.args, "--onto=%s",
 693                                         oid_to_hex(&opts->onto->object.oid));
 694                if (opts->squash_onto)
 695                        argv_array_pushf(&child.args, "--squash-onto=%s",
 696                                         oid_to_hex(opts->squash_onto));
 697                if (opts->onto_name)
 698                        argv_array_pushf(&child.args, "--onto-name=%s",
 699                                         opts->onto_name);
 700                argv_array_pushf(&child.args, "--head-name=%s",
 701                                 opts->head_name ?
 702                                 opts->head_name : "detached HEAD");
 703                if (opts->strategy)
 704                        argv_array_pushf(&child.args, "--strategy=%s",
 705                                         opts->strategy);
 706                if (opts->strategy_opts)
 707                        argv_array_pushf(&child.args, "--strategy-opts=%s",
 708                                         opts->strategy_opts);
 709                if (opts->switch_to)
 710                        argv_array_pushf(&child.args, "--switch-to=%s",
 711                                         opts->switch_to);
 712                if (opts->cmd)
 713                        argv_array_pushf(&child.args, "--cmd=%s", opts->cmd);
 714                if (opts->allow_empty_message)
 715                        argv_array_push(&child.args, "--allow-empty-message");
 716                if (opts->allow_rerere_autoupdate > 0)
 717                        argv_array_push(&child.args, "--rerere-autoupdate");
 718                else if (opts->allow_rerere_autoupdate == 0)
 719                        argv_array_push(&child.args, "--no-rerere-autoupdate");
 720                if (opts->gpg_sign_opt)
 721                        argv_array_push(&child.args, opts->gpg_sign_opt);
 722                if (opts->signoff)
 723                        argv_array_push(&child.args, "--signoff");
 724                if (opts->reschedule_failed_exec)
 725                        argv_array_push(&child.args, "--reschedule-failed-exec");
 726
 727                status = run_command(&child);
 728                goto finished_rebase;
 729        }
 730
 731        if (opts->type == REBASE_AM) {
 732                status = run_am(opts);
 733                goto finished_rebase;
 734        }
 735
 736        add_var(&script_snippet, "GIT_DIR", absolute_path(get_git_dir()));
 737        add_var(&script_snippet, "state_dir", opts->state_dir);
 738
 739        add_var(&script_snippet, "upstream_name", opts->upstream_name);
 740        add_var(&script_snippet, "upstream", opts->upstream ?
 741                oid_to_hex(&opts->upstream->object.oid) : NULL);
 742        add_var(&script_snippet, "head_name",
 743                opts->head_name ? opts->head_name : "detached HEAD");
 744        add_var(&script_snippet, "orig_head", oid_to_hex(&opts->orig_head));
 745        add_var(&script_snippet, "onto", opts->onto ?
 746                oid_to_hex(&opts->onto->object.oid) : NULL);
 747        add_var(&script_snippet, "onto_name", opts->onto_name);
 748        add_var(&script_snippet, "revisions", opts->revisions);
 749        add_var(&script_snippet, "restrict_revision", opts->restrict_revision ?
 750                oid_to_hex(&opts->restrict_revision->object.oid) : NULL);
 751        add_var(&script_snippet, "GIT_QUIET",
 752                opts->flags & REBASE_NO_QUIET ? "" : "t");
 753        sq_quote_argv_pretty(&buf, opts->git_am_opts.argv);
 754        add_var(&script_snippet, "git_am_opt", buf.buf);
 755        strbuf_release(&buf);
 756        add_var(&script_snippet, "verbose",
 757                opts->flags & REBASE_VERBOSE ? "t" : "");
 758        add_var(&script_snippet, "diffstat",
 759                opts->flags & REBASE_DIFFSTAT ? "t" : "");
 760        add_var(&script_snippet, "force_rebase",
 761                opts->flags & REBASE_FORCE ? "t" : "");
 762        if (opts->switch_to)
 763                add_var(&script_snippet, "switch_to", opts->switch_to);
 764        add_var(&script_snippet, "action", opts->action ? opts->action : "");
 765        add_var(&script_snippet, "signoff", opts->signoff ? "--signoff" : "");
 766        add_var(&script_snippet, "allow_rerere_autoupdate",
 767                opts->allow_rerere_autoupdate < 0 ? "" :
 768                opts->allow_rerere_autoupdate ?
 769                "--rerere-autoupdate" : "--no-rerere-autoupdate");
 770        add_var(&script_snippet, "keep_empty", opts->keep_empty ? "yes" : "");
 771        add_var(&script_snippet, "autosquash", opts->autosquash ? "t" : "");
 772        add_var(&script_snippet, "gpg_sign_opt", opts->gpg_sign_opt);
 773        add_var(&script_snippet, "cmd", opts->cmd);
 774        add_var(&script_snippet, "allow_empty_message",
 775                opts->allow_empty_message ?  "--allow-empty-message" : "");
 776        add_var(&script_snippet, "rebase_merges",
 777                opts->rebase_merges ? "t" : "");
 778        add_var(&script_snippet, "rebase_cousins",
 779                opts->rebase_cousins ? "t" : "");
 780        add_var(&script_snippet, "strategy", opts->strategy);
 781        add_var(&script_snippet, "strategy_opts", opts->strategy_opts);
 782        add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
 783        add_var(&script_snippet, "squash_onto",
 784                opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
 785        add_var(&script_snippet, "git_format_patch_opt",
 786                opts->git_format_patch_opt.buf);
 787
 788        if (is_interactive(opts) &&
 789            !(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
 790                strbuf_addstr(&script_snippet,
 791                              "GIT_SEQUENCE_EDITOR=:; export GIT_SEQUENCE_EDITOR; ");
 792                opts->autosquash = 0;
 793        }
 794
 795        switch (opts->type) {
 796        case REBASE_AM:
 797                backend = "git-rebase--am";
 798                backend_func = "git_rebase__am";
 799                break;
 800        case REBASE_PRESERVE_MERGES:
 801                backend = "git-rebase--preserve-merges";
 802                backend_func = "git_rebase__preserve_merges";
 803                break;
 804        default:
 805                BUG("Unhandled rebase type %d", opts->type);
 806                break;
 807        }
 808
 809        strbuf_addf(&script_snippet,
 810                    ". git-sh-setup && . git-rebase--common &&"
 811                    " . %s && %s", backend, backend_func);
 812        argv[0] = script_snippet.buf;
 813
 814        status = run_command_v_opt(argv, RUN_USING_SHELL);
 815finished_rebase:
 816        if (opts->dont_finish_rebase)
 817                ; /* do nothing */
 818        else if (opts->type == REBASE_INTERACTIVE)
 819                ; /* interactive rebase cleans up after itself */
 820        else if (status == 0) {
 821                if (!file_exists(state_dir_path("stopped-sha", opts)))
 822                        finish_rebase(opts);
 823        } else if (status == 2) {
 824                struct strbuf dir = STRBUF_INIT;
 825
 826                apply_autostash(opts);
 827                strbuf_addstr(&dir, opts->state_dir);
 828                remove_dir_recursively(&dir, 0);
 829                strbuf_release(&dir);
 830                die("Nothing to do");
 831        }
 832
 833        strbuf_release(&script_snippet);
 834
 835        return status ? -1 : 0;
 836}
 837
 838static int rebase_config(const char *var, const char *value, void *data)
 839{
 840        struct rebase_options *opts = data;
 841
 842        if (!strcmp(var, "rebase.stat")) {
 843                if (git_config_bool(var, value))
 844                        opts->flags |= REBASE_DIFFSTAT;
 845                else
 846                        opts->flags &= !REBASE_DIFFSTAT;
 847                return 0;
 848        }
 849
 850        if (!strcmp(var, "rebase.autosquash")) {
 851                opts->autosquash = git_config_bool(var, value);
 852                return 0;
 853        }
 854
 855        if (!strcmp(var, "commit.gpgsign")) {
 856                free(opts->gpg_sign_opt);
 857                opts->gpg_sign_opt = git_config_bool(var, value) ?
 858                        xstrdup("-S") : NULL;
 859                return 0;
 860        }
 861
 862        if (!strcmp(var, "rebase.autostash")) {
 863                opts->autostash = git_config_bool(var, value);
 864                return 0;
 865        }
 866
 867        if (!strcmp(var, "rebase.reschedulefailedexec")) {
 868                opts->reschedule_failed_exec = git_config_bool(var, value);
 869                return 0;
 870        }
 871
 872        return git_default_config(var, value, data);
 873}
 874
 875/*
 876 * Determines whether the commits in from..to are linear, i.e. contain
 877 * no merge commits. This function *expects* `from` to be an ancestor of
 878 * `to`.
 879 */
 880static int is_linear_history(struct commit *from, struct commit *to)
 881{
 882        while (to && to != from) {
 883                parse_commit(to);
 884                if (!to->parents)
 885                        return 1;
 886                if (to->parents->next)
 887                        return 0;
 888                to = to->parents->item;
 889        }
 890        return 1;
 891}
 892
 893static int can_fast_forward(struct commit *onto, struct object_id *head_oid,
 894                            struct object_id *merge_base)
 895{
 896        struct commit *head = lookup_commit(the_repository, head_oid);
 897        struct commit_list *merge_bases;
 898        int res;
 899
 900        if (!head)
 901                return 0;
 902
 903        merge_bases = get_merge_bases(onto, head);
 904        if (merge_bases && !merge_bases->next) {
 905                oidcpy(merge_base, &merge_bases->item->object.oid);
 906                res = oideq(merge_base, &onto->object.oid);
 907        } else {
 908                oidcpy(merge_base, &null_oid);
 909                res = 0;
 910        }
 911        free_commit_list(merge_bases);
 912        return res && is_linear_history(onto, head);
 913}
 914
 915/* -i followed by -m is still -i */
 916static int parse_opt_merge(const struct option *opt, const char *arg, int unset)
 917{
 918        struct rebase_options *opts = opt->value;
 919
 920        BUG_ON_OPT_NEG(unset);
 921        BUG_ON_OPT_ARG(arg);
 922
 923        if (!is_interactive(opts))
 924                opts->type = REBASE_MERGE;
 925
 926        return 0;
 927}
 928
 929/* -i followed by -p is still explicitly interactive, but -p alone is not */
 930static int parse_opt_interactive(const struct option *opt, const char *arg,
 931                                 int unset)
 932{
 933        struct rebase_options *opts = opt->value;
 934
 935        BUG_ON_OPT_NEG(unset);
 936        BUG_ON_OPT_ARG(arg);
 937
 938        opts->type = REBASE_INTERACTIVE;
 939        opts->flags |= REBASE_INTERACTIVE_EXPLICIT;
 940
 941        return 0;
 942}
 943
 944static void NORETURN error_on_missing_default_upstream(void)
 945{
 946        struct branch *current_branch = branch_get(NULL);
 947
 948        printf(_("%s\n"
 949                 "Please specify which branch you want to rebase against.\n"
 950                 "See git-rebase(1) for details.\n"
 951                 "\n"
 952                 "    git rebase '<branch>'\n"
 953                 "\n"),
 954                current_branch ? _("There is no tracking information for "
 955                        "the current branch.") :
 956                        _("You are not currently on a branch."));
 957
 958        if (current_branch) {
 959                const char *remote = current_branch->remote_name;
 960
 961                if (!remote)
 962                        remote = _("<remote>");
 963
 964                printf(_("If you wish to set tracking information for this "
 965                         "branch you can do so with:\n"
 966                         "\n"
 967                         "    git branch --set-upstream-to=%s/<branch> %s\n"
 968                         "\n"),
 969                       remote, current_branch->name);
 970        }
 971        exit(1);
 972}
 973
 974static void set_reflog_action(struct rebase_options *options)
 975{
 976        const char *env;
 977        struct strbuf buf = STRBUF_INIT;
 978
 979        if (!is_interactive(options))
 980                return;
 981
 982        env = getenv(GIT_REFLOG_ACTION_ENVIRONMENT);
 983        if (env && strcmp("rebase", env))
 984                return; /* only override it if it is "rebase" */
 985
 986        strbuf_addf(&buf, "rebase -i (%s)", options->action);
 987        setenv(GIT_REFLOG_ACTION_ENVIRONMENT, buf.buf, 1);
 988        strbuf_release(&buf);
 989}
 990
 991static int check_exec_cmd(const char *cmd)
 992{
 993        if (strchr(cmd, '\n'))
 994                return error(_("exec commands cannot contain newlines"));
 995
 996        /* Does the command consist purely of whitespace? */
 997        if (!cmd[strspn(cmd, " \t\r\f\v")])
 998                return error(_("empty exec command"));
 999
1000        return 0;
1001}
1002
1003
1004int cmd_rebase(int argc, const char **argv, const char *prefix)
1005{
1006        struct rebase_options options = {
1007                .type = REBASE_UNSPECIFIED,
1008                .flags = REBASE_NO_QUIET,
1009                .git_am_opts = ARGV_ARRAY_INIT,
1010                .allow_rerere_autoupdate  = -1,
1011                .allow_empty_message = 1,
1012                .git_format_patch_opt = STRBUF_INIT,
1013        };
1014        const char *branch_name;
1015        int ret, flags, total_argc, in_progress = 0;
1016        int ok_to_skip_pre_rebase = 0;
1017        struct strbuf msg = STRBUF_INIT;
1018        struct strbuf revisions = STRBUF_INIT;
1019        struct strbuf buf = STRBUF_INIT;
1020        struct object_id merge_base;
1021        enum {
1022                NO_ACTION,
1023                ACTION_CONTINUE,
1024                ACTION_SKIP,
1025                ACTION_ABORT,
1026                ACTION_QUIT,
1027                ACTION_EDIT_TODO,
1028                ACTION_SHOW_CURRENT_PATCH,
1029        } action = NO_ACTION;
1030        const char *gpg_sign = NULL;
1031        struct string_list exec = STRING_LIST_INIT_NODUP;
1032        const char *rebase_merges = NULL;
1033        int fork_point = -1;
1034        struct string_list strategy_options = STRING_LIST_INIT_NODUP;
1035        struct object_id squash_onto;
1036        char *squash_onto_name = NULL;
1037        struct option builtin_rebase_options[] = {
1038                OPT_STRING(0, "onto", &options.onto_name,
1039                           N_("revision"),
1040                           N_("rebase onto given branch instead of upstream")),
1041                OPT_BOOL(0, "no-verify", &ok_to_skip_pre_rebase,
1042                         N_("allow pre-rebase hook to run")),
1043                OPT_NEGBIT('q', "quiet", &options.flags,
1044                           N_("be quiet. implies --no-stat"),
1045                           REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
1046                OPT_BIT('v', "verbose", &options.flags,
1047                        N_("display a diffstat of what changed upstream"),
1048                        REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
1049                {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
1050                        N_("do not show diffstat of what changed upstream"),
1051                        PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
1052                OPT_BOOL(0, "signoff", &options.signoff,
1053                         N_("add a Signed-off-by: line to each commit")),
1054                OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &options.git_am_opts,
1055                                  NULL, N_("passed to 'git am'"),
1056                                  PARSE_OPT_NOARG),
1057                OPT_PASSTHRU_ARGV(0, "committer-date-is-author-date",
1058                                  &options.git_am_opts, NULL,
1059                                  N_("passed to 'git am'"), PARSE_OPT_NOARG),
1060                OPT_PASSTHRU_ARGV(0, "ignore-date", &options.git_am_opts, NULL,
1061                                  N_("passed to 'git am'"), PARSE_OPT_NOARG),
1062                OPT_PASSTHRU_ARGV('C', NULL, &options.git_am_opts, N_("n"),
1063                                  N_("passed to 'git apply'"), 0),
1064                OPT_PASSTHRU_ARGV(0, "whitespace", &options.git_am_opts,
1065                                  N_("action"), N_("passed to 'git apply'"), 0),
1066                OPT_BIT('f', "force-rebase", &options.flags,
1067                        N_("cherry-pick all commits, even if unchanged"),
1068                        REBASE_FORCE),
1069                OPT_BIT(0, "no-ff", &options.flags,
1070                        N_("cherry-pick all commits, even if unchanged"),
1071                        REBASE_FORCE),
1072                OPT_CMDMODE(0, "continue", &action, N_("continue"),
1073                            ACTION_CONTINUE),
1074                OPT_CMDMODE(0, "skip", &action,
1075                            N_("skip current patch and continue"), ACTION_SKIP),
1076                OPT_CMDMODE(0, "abort", &action,
1077                            N_("abort and check out the original branch"),
1078                            ACTION_ABORT),
1079                OPT_CMDMODE(0, "quit", &action,
1080                            N_("abort but keep HEAD where it is"), ACTION_QUIT),
1081                OPT_CMDMODE(0, "edit-todo", &action, N_("edit the todo list "
1082                            "during an interactive rebase"), ACTION_EDIT_TODO),
1083                OPT_CMDMODE(0, "show-current-patch", &action,
1084                            N_("show the patch file being applied or merged"),
1085                            ACTION_SHOW_CURRENT_PATCH),
1086                { OPTION_CALLBACK, 'm', "merge", &options, NULL,
1087                        N_("use merging strategies to rebase"),
1088                        PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1089                        parse_opt_merge },
1090                { OPTION_CALLBACK, 'i', "interactive", &options, NULL,
1091                        N_("let the user edit the list of commits to rebase"),
1092                        PARSE_OPT_NOARG | PARSE_OPT_NONEG,
1093                        parse_opt_interactive },
1094                OPT_SET_INT('p', "preserve-merges", &options.type,
1095                            N_("try to recreate merges instead of ignoring "
1096                               "them"), REBASE_PRESERVE_MERGES),
1097                OPT_BOOL(0, "rerere-autoupdate",
1098                         &options.allow_rerere_autoupdate,
1099                         N_("allow rerere to update index with resolved "
1100                            "conflict")),
1101                OPT_BOOL('k', "keep-empty", &options.keep_empty,
1102                         N_("preserve empty commits during rebase")),
1103                OPT_BOOL(0, "autosquash", &options.autosquash,
1104                         N_("move commits that begin with "
1105                            "squash!/fixup! under -i")),
1106                { OPTION_STRING, 'S', "gpg-sign", &gpg_sign, N_("key-id"),
1107                        N_("GPG-sign commits"),
1108                        PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
1109                OPT_BOOL(0, "autostash", &options.autostash,
1110                         N_("automatically stash/stash pop before and after")),
1111                OPT_STRING_LIST('x', "exec", &exec, N_("exec"),
1112                                N_("add exec lines after each commit of the "
1113                                   "editable list")),
1114                OPT_BOOL(0, "allow-empty-message",
1115                         &options.allow_empty_message,
1116                         N_("allow rebasing commits with empty messages")),
1117                {OPTION_STRING, 'r', "rebase-merges", &rebase_merges,
1118                        N_("mode"),
1119                        N_("try to rebase merges instead of skipping them"),
1120                        PARSE_OPT_OPTARG, NULL, (intptr_t)""},
1121                OPT_BOOL(0, "fork-point", &fork_point,
1122                         N_("use 'merge-base --fork-point' to refine upstream")),
1123                OPT_STRING('s', "strategy", &options.strategy,
1124                           N_("strategy"), N_("use the given merge strategy")),
1125                OPT_STRING_LIST('X', "strategy-option", &strategy_options,
1126                                N_("option"),
1127                                N_("pass the argument through to the merge "
1128                                   "strategy")),
1129                OPT_BOOL(0, "root", &options.root,
1130                         N_("rebase all reachable commits up to the root(s)")),
1131                OPT_BOOL(0, "reschedule-failed-exec",
1132                         &options.reschedule_failed_exec,
1133                         N_("automatically re-schedule any `exec` that fails")),
1134                OPT_END(),
1135        };
1136        int i;
1137
1138        /*
1139         * NEEDSWORK: Once the builtin rebase has been tested enough
1140         * and git-legacy-rebase.sh is retired to contrib/, this preamble
1141         * can be removed.
1142         */
1143
1144        if (!use_builtin_rebase()) {
1145                const char *path = mkpath("%s/git-legacy-rebase",
1146                                          git_exec_path());
1147
1148                if (sane_execvp(path, (char **)argv) < 0)
1149                        die_errno(_("could not exec %s"), path);
1150                else
1151                        BUG("sane_execvp() returned???");
1152        }
1153
1154        if (argc == 2 && !strcmp(argv[1], "-h"))
1155                usage_with_options(builtin_rebase_usage,
1156                                   builtin_rebase_options);
1157
1158        prefix = setup_git_directory();
1159        trace_repo_setup(prefix);
1160        setup_work_tree();
1161
1162        git_config(rebase_config, &options);
1163
1164        strbuf_reset(&buf);
1165        strbuf_addf(&buf, "%s/applying", apply_dir());
1166        if(file_exists(buf.buf))
1167                die(_("It looks like 'git am' is in progress. Cannot rebase."));
1168
1169        if (is_directory(apply_dir())) {
1170                options.type = REBASE_AM;
1171                options.state_dir = apply_dir();
1172        } else if (is_directory(merge_dir())) {
1173                strbuf_reset(&buf);
1174                strbuf_addf(&buf, "%s/rewritten", merge_dir());
1175                if (is_directory(buf.buf)) {
1176                        options.type = REBASE_PRESERVE_MERGES;
1177                        options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1178                } else {
1179                        strbuf_reset(&buf);
1180                        strbuf_addf(&buf, "%s/interactive", merge_dir());
1181                        if(file_exists(buf.buf)) {
1182                                options.type = REBASE_INTERACTIVE;
1183                                options.flags |= REBASE_INTERACTIVE_EXPLICIT;
1184                        } else
1185                                options.type = REBASE_MERGE;
1186                }
1187                options.state_dir = merge_dir();
1188        }
1189
1190        if (options.type != REBASE_UNSPECIFIED)
1191                in_progress = 1;
1192
1193        total_argc = argc;
1194        argc = parse_options(argc, argv, prefix,
1195                             builtin_rebase_options,
1196                             builtin_rebase_usage, 0);
1197
1198        if (action != NO_ACTION && total_argc != 2) {
1199                usage_with_options(builtin_rebase_usage,
1200                                   builtin_rebase_options);
1201        }
1202
1203        if (argc > 2)
1204                usage_with_options(builtin_rebase_usage,
1205                                   builtin_rebase_options);
1206
1207        if (action != NO_ACTION && !in_progress)
1208                die(_("No rebase in progress?"));
1209        setenv(GIT_REFLOG_ACTION_ENVIRONMENT, "rebase", 0);
1210
1211        if (action == ACTION_EDIT_TODO && !is_interactive(&options))
1212                die(_("The --edit-todo action can only be used during "
1213                      "interactive rebase."));
1214
1215        switch (action) {
1216        case ACTION_CONTINUE: {
1217                struct object_id head;
1218                struct lock_file lock_file = LOCK_INIT;
1219                int fd;
1220
1221                options.action = "continue";
1222                set_reflog_action(&options);
1223
1224                /* Sanity check */
1225                if (get_oid("HEAD", &head))
1226                        die(_("Cannot read HEAD"));
1227
1228                fd = hold_locked_index(&lock_file, 0);
1229                if (repo_read_index(the_repository) < 0)
1230                        die(_("could not read index"));
1231                refresh_index(the_repository->index, REFRESH_QUIET, NULL, NULL,
1232                              NULL);
1233                if (0 <= fd)
1234                        repo_update_index_if_able(the_repository, &lock_file);
1235                rollback_lock_file(&lock_file);
1236
1237                if (has_unstaged_changes(the_repository, 1)) {
1238                        puts(_("You must edit all merge conflicts and then\n"
1239                               "mark them as resolved using git add"));
1240                        exit(1);
1241                }
1242                if (read_basic_state(&options))
1243                        exit(1);
1244                goto run_rebase;
1245        }
1246        case ACTION_SKIP: {
1247                struct string_list merge_rr = STRING_LIST_INIT_DUP;
1248
1249                options.action = "skip";
1250                set_reflog_action(&options);
1251
1252                rerere_clear(the_repository, &merge_rr);
1253                string_list_clear(&merge_rr, 1);
1254
1255                if (reset_head(NULL, "reset", NULL, RESET_HEAD_HARD,
1256                               NULL, NULL) < 0)
1257                        die(_("could not discard worktree changes"));
1258                remove_branch_state(the_repository);
1259                if (read_basic_state(&options))
1260                        exit(1);
1261                goto run_rebase;
1262        }
1263        case ACTION_ABORT: {
1264                struct string_list merge_rr = STRING_LIST_INIT_DUP;
1265                options.action = "abort";
1266                set_reflog_action(&options);
1267
1268                rerere_clear(the_repository, &merge_rr);
1269                string_list_clear(&merge_rr, 1);
1270
1271                if (read_basic_state(&options))
1272                        exit(1);
1273                if (reset_head(&options.orig_head, "reset",
1274                               options.head_name, RESET_HEAD_HARD,
1275                               NULL, NULL) < 0)
1276                        die(_("could not move back to %s"),
1277                            oid_to_hex(&options.orig_head));
1278                remove_branch_state(the_repository);
1279                ret = finish_rebase(&options);
1280                goto cleanup;
1281        }
1282        case ACTION_QUIT: {
1283                strbuf_reset(&buf);
1284                strbuf_addstr(&buf, options.state_dir);
1285                ret = !!remove_dir_recursively(&buf, 0);
1286                if (ret)
1287                        die(_("could not remove '%s'"), options.state_dir);
1288                goto cleanup;
1289        }
1290        case ACTION_EDIT_TODO:
1291                options.action = "edit-todo";
1292                options.dont_finish_rebase = 1;
1293                goto run_rebase;
1294        case ACTION_SHOW_CURRENT_PATCH:
1295                options.action = "show-current-patch";
1296                options.dont_finish_rebase = 1;
1297                goto run_rebase;
1298        case NO_ACTION:
1299                break;
1300        default:
1301                BUG("action: %d", action);
1302        }
1303
1304        /* Make sure no rebase is in progress */
1305        if (in_progress) {
1306                const char *last_slash = strrchr(options.state_dir, '/');
1307                const char *state_dir_base =
1308                        last_slash ? last_slash + 1 : options.state_dir;
1309                const char *cmd_live_rebase =
1310                        "git rebase (--continue | --abort | --skip)";
1311                strbuf_reset(&buf);
1312                strbuf_addf(&buf, "rm -fr \"%s\"", options.state_dir);
1313                die(_("It seems that there is already a %s directory, and\n"
1314                      "I wonder if you are in the middle of another rebase.  "
1315                      "If that is the\n"
1316                      "case, please try\n\t%s\n"
1317                      "If that is not the case, please\n\t%s\n"
1318                      "and run me again.  I am stopping in case you still "
1319                      "have something\n"
1320                      "valuable there.\n"),
1321                    state_dir_base, cmd_live_rebase, buf.buf);
1322        }
1323
1324        for (i = 0; i < options.git_am_opts.argc; i++) {
1325                const char *option = options.git_am_opts.argv[i], *p;
1326                if (!strcmp(option, "--committer-date-is-author-date") ||
1327                    !strcmp(option, "--ignore-date") ||
1328                    !strcmp(option, "--whitespace=fix") ||
1329                    !strcmp(option, "--whitespace=strip"))
1330                        options.flags |= REBASE_FORCE;
1331                else if (skip_prefix(option, "-C", &p)) {
1332                        while (*p)
1333                                if (!isdigit(*(p++)))
1334                                        die(_("switch `C' expects a "
1335                                              "numerical value"));
1336                } else if (skip_prefix(option, "--whitespace=", &p)) {
1337                        if (*p && strcmp(p, "warn") && strcmp(p, "nowarn") &&
1338                            strcmp(p, "error") && strcmp(p, "error-all"))
1339                                die("Invalid whitespace option: '%s'", p);
1340                }
1341        }
1342
1343        for (i = 0; i < exec.nr; i++)
1344                if (check_exec_cmd(exec.items[i].string))
1345                        exit(1);
1346
1347        if (!(options.flags & REBASE_NO_QUIET))
1348                argv_array_push(&options.git_am_opts, "-q");
1349
1350        if (options.keep_empty)
1351                imply_interactive(&options, "--keep-empty");
1352
1353        if (gpg_sign) {
1354                free(options.gpg_sign_opt);
1355                options.gpg_sign_opt = xstrfmt("-S%s", gpg_sign);
1356        }
1357
1358        if (exec.nr) {
1359                int i;
1360
1361                imply_interactive(&options, "--exec");
1362
1363                strbuf_reset(&buf);
1364                for (i = 0; i < exec.nr; i++)
1365                        strbuf_addf(&buf, "exec %s\n", exec.items[i].string);
1366                options.cmd = xstrdup(buf.buf);
1367        }
1368
1369        if (rebase_merges) {
1370                if (!*rebase_merges)
1371                        ; /* default mode; do nothing */
1372                else if (!strcmp("rebase-cousins", rebase_merges))
1373                        options.rebase_cousins = 1;
1374                else if (strcmp("no-rebase-cousins", rebase_merges))
1375                        die(_("Unknown mode: %s"), rebase_merges);
1376                options.rebase_merges = 1;
1377                imply_interactive(&options, "--rebase-merges");
1378        }
1379
1380        if (strategy_options.nr) {
1381                int i;
1382
1383                if (!options.strategy)
1384                        options.strategy = "recursive";
1385
1386                strbuf_reset(&buf);
1387                for (i = 0; i < strategy_options.nr; i++)
1388                        strbuf_addf(&buf, " --%s",
1389                                    strategy_options.items[i].string);
1390                options.strategy_opts = xstrdup(buf.buf);
1391        }
1392
1393        if (options.strategy) {
1394                options.strategy = xstrdup(options.strategy);
1395                switch (options.type) {
1396                case REBASE_AM:
1397                        die(_("--strategy requires --merge or --interactive"));
1398                case REBASE_MERGE:
1399                case REBASE_INTERACTIVE:
1400                case REBASE_PRESERVE_MERGES:
1401                        /* compatible */
1402                        break;
1403                case REBASE_UNSPECIFIED:
1404                        options.type = REBASE_MERGE;
1405                        break;
1406                default:
1407                        BUG("unhandled rebase type (%d)", options.type);
1408                }
1409        }
1410
1411        if (options.type == REBASE_MERGE)
1412                imply_interactive(&options, "--merge");
1413
1414        if (options.root && !options.onto_name)
1415                imply_interactive(&options, "--root without --onto");
1416
1417        if (isatty(2) && options.flags & REBASE_NO_QUIET)
1418                strbuf_addstr(&options.git_format_patch_opt, " --progress");
1419
1420        switch (options.type) {
1421        case REBASE_MERGE:
1422        case REBASE_INTERACTIVE:
1423        case REBASE_PRESERVE_MERGES:
1424                options.state_dir = merge_dir();
1425                break;
1426        case REBASE_AM:
1427                options.state_dir = apply_dir();
1428                break;
1429        default:
1430                /* the default rebase backend is `--am` */
1431                options.type = REBASE_AM;
1432                options.state_dir = apply_dir();
1433                break;
1434        }
1435
1436        if (options.reschedule_failed_exec && !is_interactive(&options))
1437                die(_("%s requires an interactive rebase"), "--reschedule-failed-exec");
1438
1439        if (options.git_am_opts.argc) {
1440                /* all am options except -q are compatible only with --am */
1441                for (i = options.git_am_opts.argc - 1; i >= 0; i--)
1442                        if (strcmp(options.git_am_opts.argv[i], "-q"))
1443                                break;
1444
1445                if (is_interactive(&options) && i >= 0)
1446                        die(_("cannot combine am options with either "
1447                              "interactive or merge options"));
1448        }
1449
1450        if (options.signoff) {
1451                if (options.type == REBASE_PRESERVE_MERGES)
1452                        die("cannot combine '--signoff' with "
1453                            "'--preserve-merges'");
1454                argv_array_push(&options.git_am_opts, "--signoff");
1455                options.flags |= REBASE_FORCE;
1456        }
1457
1458        if (options.type == REBASE_PRESERVE_MERGES) {
1459                /*
1460                 * Note: incompatibility with --signoff handled in signoff block above
1461                 * Note: incompatibility with --interactive is just a strong warning;
1462                 *       git-rebase.txt caveats with "unless you know what you are doing"
1463                 */
1464                if (options.rebase_merges)
1465                        die(_("cannot combine '--preserve-merges' with "
1466                              "'--rebase-merges'"));
1467
1468                if (options.reschedule_failed_exec)
1469                        die(_("error: cannot combine '--preserve-merges' with "
1470                              "'--reschedule-failed-exec'"));
1471        }
1472
1473        if (options.rebase_merges) {
1474                if (strategy_options.nr)
1475                        die(_("cannot combine '--rebase-merges' with "
1476                              "'--strategy-option'"));
1477                if (options.strategy)
1478                        die(_("cannot combine '--rebase-merges' with "
1479                              "'--strategy'"));
1480        }
1481
1482        if (!options.root) {
1483                if (argc < 1) {
1484                        struct branch *branch;
1485
1486                        branch = branch_get(NULL);
1487                        options.upstream_name = branch_get_upstream(branch,
1488                                                                    NULL);
1489                        if (!options.upstream_name)
1490                                error_on_missing_default_upstream();
1491                        if (fork_point < 0)
1492                                fork_point = 1;
1493                } else {
1494                        options.upstream_name = argv[0];
1495                        argc--;
1496                        argv++;
1497                        if (!strcmp(options.upstream_name, "-"))
1498                                options.upstream_name = "@{-1}";
1499                }
1500                options.upstream = peel_committish(options.upstream_name);
1501                if (!options.upstream)
1502                        die(_("invalid upstream '%s'"), options.upstream_name);
1503                options.upstream_arg = options.upstream_name;
1504        } else {
1505                if (!options.onto_name) {
1506                        if (commit_tree("", 0, the_hash_algo->empty_tree, NULL,
1507                                        &squash_onto, NULL, NULL) < 0)
1508                                die(_("Could not create new root commit"));
1509                        options.squash_onto = &squash_onto;
1510                        options.onto_name = squash_onto_name =
1511                                xstrdup(oid_to_hex(&squash_onto));
1512                }
1513                options.upstream_name = NULL;
1514                options.upstream = NULL;
1515                if (argc > 1)
1516                        usage_with_options(builtin_rebase_usage,
1517                                           builtin_rebase_options);
1518                options.upstream_arg = "--root";
1519        }
1520
1521        /* Make sure the branch to rebase onto is valid. */
1522        if (!options.onto_name)
1523                options.onto_name = options.upstream_name;
1524        if (strstr(options.onto_name, "...")) {
1525                if (get_oid_mb(options.onto_name, &merge_base) < 0)
1526                        die(_("'%s': need exactly one merge base"),
1527                            options.onto_name);
1528                options.onto = lookup_commit_or_die(&merge_base,
1529                                                    options.onto_name);
1530        } else {
1531                options.onto = peel_committish(options.onto_name);
1532                if (!options.onto)
1533                        die(_("Does not point to a valid commit '%s'"),
1534                                options.onto_name);
1535        }
1536
1537        /*
1538         * If the branch to rebase is given, that is the branch we will rebase
1539         * branch_name -- branch/commit being rebased, or
1540         *                HEAD (already detached)
1541         * orig_head -- commit object name of tip of the branch before rebasing
1542         * head_name -- refs/heads/<that-branch> or NULL (detached HEAD)
1543         */
1544        if (argc == 1) {
1545                /* Is it "rebase other branchname" or "rebase other commit"? */
1546                branch_name = argv[0];
1547                options.switch_to = argv[0];
1548
1549                /* Is it a local branch? */
1550                strbuf_reset(&buf);
1551                strbuf_addf(&buf, "refs/heads/%s", branch_name);
1552                if (!read_ref(buf.buf, &options.orig_head))
1553                        options.head_name = xstrdup(buf.buf);
1554                /* If not is it a valid ref (branch or commit)? */
1555                else if (!get_oid(branch_name, &options.orig_head))
1556                        options.head_name = NULL;
1557                else
1558                        die(_("fatal: no such branch/commit '%s'"),
1559                            branch_name);
1560        } else if (argc == 0) {
1561                /* Do not need to switch branches, we are already on it. */
1562                options.head_name =
1563                        xstrdup_or_null(resolve_ref_unsafe("HEAD", 0, NULL,
1564                                         &flags));
1565                if (!options.head_name)
1566                        die(_("No such ref: %s"), "HEAD");
1567                if (flags & REF_ISSYMREF) {
1568                        if (!skip_prefix(options.head_name,
1569                                         "refs/heads/", &branch_name))
1570                                branch_name = options.head_name;
1571
1572                } else {
1573                        free(options.head_name);
1574                        options.head_name = NULL;
1575                        branch_name = "HEAD";
1576                }
1577                if (get_oid("HEAD", &options.orig_head))
1578                        die(_("Could not resolve HEAD to a revision"));
1579        } else
1580                BUG("unexpected number of arguments left to parse");
1581
1582        if (fork_point > 0) {
1583                struct commit *head =
1584                        lookup_commit_reference(the_repository,
1585                                                &options.orig_head);
1586                options.restrict_revision =
1587                        get_fork_point(options.upstream_name, head);
1588        }
1589
1590        if (repo_read_index(the_repository) < 0)
1591                die(_("could not read index"));
1592
1593        if (options.autostash) {
1594                struct lock_file lock_file = LOCK_INIT;
1595                int fd;
1596
1597                fd = hold_locked_index(&lock_file, 0);
1598                refresh_cache(REFRESH_QUIET);
1599                if (0 <= fd)
1600                        repo_update_index_if_able(the_repository, &lock_file);
1601                rollback_lock_file(&lock_file);
1602
1603                if (has_unstaged_changes(the_repository, 1) ||
1604                    has_uncommitted_changes(the_repository, 1)) {
1605                        const char *autostash =
1606                                state_dir_path("autostash", &options);
1607                        struct child_process stash = CHILD_PROCESS_INIT;
1608                        struct object_id oid;
1609                        struct commit *head =
1610                                lookup_commit_reference(the_repository,
1611                                                        &options.orig_head);
1612
1613                        argv_array_pushl(&stash.args,
1614                                         "stash", "create", "autostash", NULL);
1615                        stash.git_cmd = 1;
1616                        stash.no_stdin = 1;
1617                        strbuf_reset(&buf);
1618                        if (capture_command(&stash, &buf, GIT_MAX_HEXSZ))
1619                                die(_("Cannot autostash"));
1620                        strbuf_trim_trailing_newline(&buf);
1621                        if (get_oid(buf.buf, &oid))
1622                                die(_("Unexpected stash response: '%s'"),
1623                                    buf.buf);
1624                        strbuf_reset(&buf);
1625                        strbuf_add_unique_abbrev(&buf, &oid, DEFAULT_ABBREV);
1626
1627                        if (safe_create_leading_directories_const(autostash))
1628                                die(_("Could not create directory for '%s'"),
1629                                    options.state_dir);
1630                        write_file(autostash, "%s", oid_to_hex(&oid));
1631                        printf(_("Created autostash: %s\n"), buf.buf);
1632                        if (reset_head(&head->object.oid, "reset --hard",
1633                                       NULL, RESET_HEAD_HARD, NULL, NULL) < 0)
1634                                die(_("could not reset --hard"));
1635                        printf(_("HEAD is now at %s"),
1636                               find_unique_abbrev(&head->object.oid,
1637                                                  DEFAULT_ABBREV));
1638                        strbuf_reset(&buf);
1639                        pp_commit_easy(CMIT_FMT_ONELINE, head, &buf);
1640                        if (buf.len > 0)
1641                                printf(" %s", buf.buf);
1642                        putchar('\n');
1643
1644                        if (discard_index(the_repository->index) < 0 ||
1645                                repo_read_index(the_repository) < 0)
1646                                die(_("could not read index"));
1647                }
1648        }
1649
1650        if (require_clean_work_tree(the_repository, "rebase",
1651                                    _("Please commit or stash them."), 1, 1)) {
1652                ret = 1;
1653                goto cleanup;
1654        }
1655
1656        /*
1657         * Now we are rebasing commits upstream..orig_head (or with --root,
1658         * everything leading up to orig_head) on top of onto.
1659         */
1660
1661        /*
1662         * Check if we are already based on onto with linear history,
1663         * but this should be done only when upstream and onto are the same
1664         * and if this is not an interactive rebase.
1665         */
1666        if (can_fast_forward(options.onto, &options.orig_head, &merge_base) &&
1667            !is_interactive(&options) && !options.restrict_revision &&
1668            options.upstream &&
1669            !oidcmp(&options.upstream->object.oid, &options.onto->object.oid)) {
1670                int flag;
1671
1672                if (!(options.flags & REBASE_FORCE)) {
1673                        /* Lazily switch to the target branch if needed... */
1674                        if (options.switch_to) {
1675                                struct object_id oid;
1676
1677                                if (get_oid(options.switch_to, &oid) < 0) {
1678                                        ret = !!error(_("could not parse '%s'"),
1679                                                      options.switch_to);
1680                                        goto cleanup;
1681                                }
1682
1683                                strbuf_reset(&buf);
1684                                strbuf_addf(&buf, "%s: checkout %s",
1685                                            getenv(GIT_REFLOG_ACTION_ENVIRONMENT),
1686                                            options.switch_to);
1687                                if (reset_head(&oid, "checkout",
1688                                               options.head_name,
1689                                               RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1690                                               NULL, buf.buf) < 0) {
1691                                        ret = !!error(_("could not switch to "
1692                                                        "%s"),
1693                                                      options.switch_to);
1694                                        goto cleanup;
1695                                }
1696                        }
1697
1698                        if (!(options.flags & REBASE_NO_QUIET))
1699                                ; /* be quiet */
1700                        else if (!strcmp(branch_name, "HEAD") &&
1701                                 resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1702                                puts(_("HEAD is up to date."));
1703                        else
1704                                printf(_("Current branch %s is up to date.\n"),
1705                                       branch_name);
1706                        ret = !!finish_rebase(&options);
1707                        goto cleanup;
1708                } else if (!(options.flags & REBASE_NO_QUIET))
1709                        ; /* be quiet */
1710                else if (!strcmp(branch_name, "HEAD") &&
1711                         resolve_ref_unsafe("HEAD", 0, NULL, &flag))
1712                        puts(_("HEAD is up to date, rebase forced."));
1713                else
1714                        printf(_("Current branch %s is up to date, rebase "
1715                                 "forced.\n"), branch_name);
1716        }
1717
1718        /* If a hook exists, give it a chance to interrupt*/
1719        if (!ok_to_skip_pre_rebase &&
1720            run_hook_le(NULL, "pre-rebase", options.upstream_arg,
1721                        argc ? argv[0] : NULL, NULL))
1722                die(_("The pre-rebase hook refused to rebase."));
1723
1724        if (options.flags & REBASE_DIFFSTAT) {
1725                struct diff_options opts;
1726
1727                if (options.flags & REBASE_VERBOSE) {
1728                        if (is_null_oid(&merge_base))
1729                                printf(_("Changes to %s:\n"),
1730                                       oid_to_hex(&options.onto->object.oid));
1731                        else
1732                                printf(_("Changes from %s to %s:\n"),
1733                                       oid_to_hex(&merge_base),
1734                                       oid_to_hex(&options.onto->object.oid));
1735                }
1736
1737                /* We want color (if set), but no pager */
1738                diff_setup(&opts);
1739                opts.stat_width = -1; /* use full terminal width */
1740                opts.stat_graph_width = -1; /* respect statGraphWidth config */
1741                opts.output_format |=
1742                        DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
1743                opts.detect_rename = DIFF_DETECT_RENAME;
1744                diff_setup_done(&opts);
1745                diff_tree_oid(is_null_oid(&merge_base) ?
1746                              the_hash_algo->empty_tree : &merge_base,
1747                              &options.onto->object.oid, "", &opts);
1748                diffcore_std(&opts);
1749                diff_flush(&opts);
1750        }
1751
1752        if (is_interactive(&options))
1753                goto run_rebase;
1754
1755        /* Detach HEAD and reset the tree */
1756        if (options.flags & REBASE_NO_QUIET)
1757                printf(_("First, rewinding head to replay your work on top of "
1758                         "it...\n"));
1759
1760        strbuf_addf(&msg, "%s: checkout %s",
1761                    getenv(GIT_REFLOG_ACTION_ENVIRONMENT), options.onto_name);
1762        if (reset_head(&options.onto->object.oid, "checkout", NULL,
1763                       RESET_HEAD_DETACH | RESET_HEAD_RUN_POST_CHECKOUT_HOOK,
1764                       NULL, msg.buf))
1765                die(_("Could not detach HEAD"));
1766        strbuf_release(&msg);
1767
1768        /*
1769         * If the onto is a proper descendant of the tip of the branch, then
1770         * we just fast-forwarded.
1771         */
1772        strbuf_reset(&msg);
1773        if (!oidcmp(&merge_base, &options.orig_head)) {
1774                printf(_("Fast-forwarded %s to %s.\n"),
1775                        branch_name, options.onto_name);
1776                strbuf_addf(&msg, "rebase finished: %s onto %s",
1777                        options.head_name ? options.head_name : "detached HEAD",
1778                        oid_to_hex(&options.onto->object.oid));
1779                reset_head(NULL, "Fast-forwarded", options.head_name, 0,
1780                           "HEAD", msg.buf);
1781                strbuf_release(&msg);
1782                ret = !!finish_rebase(&options);
1783                goto cleanup;
1784        }
1785
1786        strbuf_addf(&revisions, "%s..%s",
1787                    options.root ? oid_to_hex(&options.onto->object.oid) :
1788                    (options.restrict_revision ?
1789                     oid_to_hex(&options.restrict_revision->object.oid) :
1790                     oid_to_hex(&options.upstream->object.oid)),
1791                    oid_to_hex(&options.orig_head));
1792
1793        options.revisions = revisions.buf;
1794
1795run_rebase:
1796        ret = !!run_specific_rebase(&options);
1797
1798cleanup:
1799        strbuf_release(&revisions);
1800        free(options.head_name);
1801        free(options.gpg_sign_opt);
1802        free(options.cmd);
1803        free(squash_onto_name);
1804        return ret;
1805}